How can RSS Subscriptions and Conversation History folders be removed in 365 Outlook web app?

[Stewart3]

How can RSS Subscriptions and Conversation History folders be removed in the 365 Outlook web app?

These are useless to our organization and I'm told to get rid of them.

The Delete is grayed-out in right-click.

In the desktop app, the Conversation History folder can be deleted, but reappears.  The RSS Subscriptions folder does not have a delete option.

Is this in the Admin controls somewhere? 

[#2]

Those are default (system) folders and cannot be removed. Even if you force remove them via low-level tools, they will be recreated. A better alternative is to "hide" them, as detailed here: https://www.slipstick.com/outlook/delete-outlooks-default-folders/

[#3]

Hide is great.
Looks like MFCMAPI may not be for the Outlook Web App, is it?

I'll give it a look.
Thanks